Electrical apparatus



Sept. 22, 1925.

R. c. cuflwiR ELECTRICAL APPARATUS v Filed July 10,1920

Inventor: Reginald Ch arles Clin Ker;

His Attorney.

Patented Sept. 22, 1925. v v M p UNITED STATES V PATENT OFFICE;

REGINALD CHARLES omen, or mwoons RUGBY, ENetAm), ASSIGNOB 'ro GENERAL ELECTRIC COMPANY, A CORPORATION or'msw YORK.

nnnc'rmcar. arrana'rus.

Application filed m 10, 1920. Serial in. 305,295.

To all'wlwm it may concept; central s indle f which is pivoted at its Be it known that 'I, RncINAu') Gnaauzs. lower en to the fran eof the condenser CLINKER, a subject of the King of Greatand is secured at its upper end to a boss k Britain, residing at Inwoods Rugby, in the formed at the center of the .scale disc g.

5 county of Warwickshire, England. have in- The plate Z, likewise designed to cooperate 60 vented certain new and useful Improvewith the fixed .plates a and to provideby ments in Electrical Apparatus, of which .the its movement the auxiliary of fine adjust following'is a specification. ment of the Condenser, is carried by sleeve Thefpresent invention relates to variable m which in turn is fastened to the memberimpedances' and has for its object to increase n provided with two upwardly projecting 66 therang'e of adjustment of such instruments extensions j 0. The knurled operating head "and to provide means whereby such adjust-'- or handlep is securedto one of h M ment may be quickly and accurately made. -sionso,by a set screw.- -The movable sector As an example'of a type of impedance to or vane l is thus rigidly connected to and which my invention is applicable, there may rotates with the operating head 1). In order be mentioned a variable condenser in which to provide a lost motion connection between a set of movable sectors or vanes enters a the movable sectors 0 and the operating set of stationarysectors orvanes. I prohead 1), I provide the disc g with slots h pose to divide the movable elements ofjsuch which embrace the extensions '0 .and which a condenser into two parts coupled together inthe particular construction illustrated are 75 by a lost motion device or its equivalent so of such a length as to permit the plate 1 to that one of the parts may be adjusted be operated by the head p through an angle through a certain angle without moving the of 90before the head commences to mov. other part. Means may be provided for' thesectorse. The spindle f is provided'with clamping the twoor more parts together so -a' friction arm r which bears upon a plate n 3 that they also may be moved as one piece. secured to the frame of the condenser. This In practice. one part may be conveniently plate which is in circuit with one of the connected to the operating head orhandle terminals 1: of'the condenser serves with the and may form the part by which the fine arm 8 to conduct current to the movable adjustment of the condenser is made, while plates 6 and l and also because of the fricthe other part may be carried upon a'spindle tional engagement between plate 8 and arm coaxial with the operating handle and may 1 prevents the sectors e from -moving before constitute the means by which a coarse adall "of the lost motion is taken up. The justment is efi'ecte other terminal e of the condenser is con- I have fou d t at the condenser above nected to the stationary plates a. described is particularly useful in the wire- The disc 9 has a scale engraved around its less art,. although by no means limited periphery, adapted to coact'with a-pointer t thereto. 3 engraved upon the top of the fixed part 11 Referring to the drawing.'Fig. 1 is a side of the condenser. Handle 7) also has in elevation of a condenser constructed in acpointer it which coacts with the second scale cordance with my invention, the container engraved on the disc g. In the construction being removed and certain parts being illustrated in Figs. 1 to 3 this latter scale is shown in a section; Fig. 2 is a top plan; so disposed that the pointer u points to zero 45 Fig. 3 is a horizontal section taken on the of the scale when the head 72 has been line 3-3 of Fig. 1: Fig. 4 is a vertical secturned In a clockwise direction and has taken tion showing a modification of the operating up all the lost motion. Y

means; and Fig. 5 is a vertical section show- For the sake of convenience, the main ing a further modification of the operating scale on the periphery of the disc 9 when means. calibrated in terms of capacity represents The fixed elements of the condenser comthe capacity of the condenser between the prisethe fixed sectors (1 supported b pilterminals '0 for any position of the main lars 6 set in the insulating base 0 fixed movable'sectors sand the sectors l turned within the top casting d. untll the pointer u points to zero. When Plates e arranged to cooperate with the uslng the condenser, as for example in tun stationary plates 0 are mounted upon the mg, the head p is turned in a. clockwise (11- rection until the capacityis slightly more than necessary; then turned in a reverse direction with the result that the "main sectors 0 remain stationary but sector -l is slightlywithdrawn from the fixed sectors 11. The total capacity is thus reduced until exact tuning is obtained and thereading of the pointer u; indicates the amount which must be subtracted from the reading of the pointer t to give the true'capacity between the terminals of the condenser;

If the-total of the capacity needed is somewhat small, so that the main movable element has only to be rotated through less than 90 (the maximum amount of lost motion provided in the example illustrated), then in turning the head 1) back, the sector Z will be turned so as to leave the fixed sectors (1' entirely. In such a case the capacity changwill now be of the opposite sign, that is, vane Z will begin to add capacity and in ',movable sectors. Figs. 4 an order to indicate the amount added a subsidiary fixed scale m is provided. This scale is so disposed that when the pointer u registers zero there is no capacity between .the movable sector Z an'dthe fixed sectors a;

.It is sometimes convenient in a condenser or this type tobe able to clam together the 5 show two means for accomplishing this. In Fig. ithe spindle f is extended to project through the operating head p and isscrew threaded at its u per exrd'to receive a clamp nut w, whic when screwedfdown upon tl ie' lbrass seating 3 let into the head 'p' clamps thespindle f to the head and therefore'locks together :the sectorse and Z. In the form shown in Fig.5 the pin which secures the head 1) to one of the extensions 0 is movable in a slot 0', thus enabling the head a: to move longitudinally ofits axis of rotation. The boss is is formed with a clutch face is, which is adapted to cooperate with a clutch face 7) formed on the under surface of the head p. Spring .2 normally holds the head 7) away from the boss h, but upon pressing downwardly on the head 7), the clutch faces engage and the spindle f as well as the extensions 0 may be rotated as one piece.

\Vhat I claim as new and desire to secure by Letters Patent of the United States, is i 1. In a condenser, relatively movable elements forming a condenser unit of one capacity range, other relatively movable ele ments forming a condenser unit of a dilferent capacity range, operating means connected to said former unit to render it responsive to all movements of said operating means and connected to said latter unit through a lost 'motion device, and means rendering said last mentioned unit responsive to all movements of said operating means.

2. In a condenser, a series of stationary plates, a series of pivoted plates adapted to be moved into the electrostatic field of said series of stationary plates, a portion of said series of pivoted plates being movable independently of a second oi'tion, means for indicating the angular distance the said first portion has been moved into the said field, a scale movable with-said first portion, a stationary scale-arranged to cover said first mentioned scale for a part of its path of movementand a pointer movable with said second portion to indicate upon said first mentioned scalethe angular position of said second portion relative to said first portion when the movement of said second portion produces a' capacitychange of one sign and to indicate upon said stationary scale the angular distance said second portion has moved into said field when the continued 7 movement of said second portion in the same direction produces a capacity change of the opposite sign.'

connected to said latter unit t rough a lost motion device, said latter unit being held from movement by said operating means during the lost motion of said device.

4. In a device whose electrical characteristics are adapted to be varied, a series of stationary elements, a series of elements adapted to be moved relative to said stationary elements to vary the electrical char acteristics of said device, a portion of said series of movable elements being movable independently of a second portion thereof,

means for indicating the distance the -first mentioned' portion has moved relative to said stationary elements, a scale movable with said first mentioned portion, a stationary scale arranged adjacent said first mentioned scale,-a pointer movable with said second portion to indicate upon said first mentioned scale the position ofsaid second portion relative to said-first portion when the movement of said-second portion produces a chan e in the electrical characteristics of one sign and to indicate upon the stationary scale the distance said second portion has moved when continued movement in the same direction produces a change .in the electrical characteristics of the opposite sign.

5. n a variable condenser, a plurality of stationaryv elements, a plurality of concentrically mounted rotatable elements in electrostatic relation therewith, one portion of said rotatable elements being movable relative to a second portion thereof, and a single operating member for adjustably moving said portions relative to said stationary elements and relative to each other.

6. In a variable condenser, a plurality of stationary elements, a plurality of movable elements in electrostaticrelation therewith,

I one portion of said movable elements being movable relative to a second portion thereof, a single operating member. for adjustably moving said portions relative to said stationary 'elements and relative to each other, means for indicating the angular resaid one portion of the movable elements,

angular relation between saidoneport and said stationar ments, and means for indicating thc elements when sai, on portion is in certain other positions" to the stationary elements; i-

In witness whereof, I have hereunto set my hand this 18th day of June, lation between said stationary elements and i V REGIbfALD CHARLES 'C-LINKER. 

